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in Section 36, T.3N., R.lO1W., and C-41356 in Section 1, T.2N., R.lO1W. No exploration or production activities have taken place on this tract. The Rangely field, the largest producing oil field in Colorado, is Located approximately 5 miles to the southwest. This field is producing oil and gas from the following formations: Hancos, Horrison, Entrada Sandstone, Chinle, and the Weber Sandstone. All of these formations are found at depths under the tract. Locatable Hinerals Low grade uranium occurs in coal beds of the Hesavecde Group a few miles south of the Skull Creek district. Distribution of uranium in the coal is unknown. No mining claims have been located within the tract. Saleable Hinerals Alluvium and colluvium deposits consisting of rock debris, sand, silt, and clay are found in minor amounts in the drainages of the tract. Hydroloxy The Williams Fork Formation is divided into three hydrologic units: the Lower Sandstone Facies, which underlies the "B" coal seam and is generally equivalent to the Trout Creek Sandstone and the upper portion of the Iles Formation; the Siltstone and Coal Facies, which consists of the interbedded coal, Siltstone, and shale strata of the Lower Williams Fork Formation; and the Upper Sandstone Facies of the Upper Williams Fork Formation. A fourth hydrologic unit is the alluvium of the White River and its tributaries. The maximum thickness of the White River alluvium near the Lease application area is about 37 feet. No major usage of groundwater has been defined. Due to the generally low yields of aquifers in the region and poor water quality, it is not expected that groundwater usage would be high. Of the water rights that exist within 70 square miles encompassing the lease application area, all are surface water rights. Recharge of the bedrock aquifers occurs primarily at higher elevations north of the lease application area through infiltration of precipitation into the strata. Discharge is by small seeps along hill sides where aquifers are exposed by erosion along the White River. The movement of Hesavecde groundwater is controlled by the Red Wash Syncline and major fracture zones located along Red Wash, Scullion Gulch, and the White River. Groundwater in the northwest part of the area moves down dip and then normal to the Red Wash Syncline. Within the central and southern portion of the area, the groundwater moves in a more southerly direction toward the White River, in response to the permeable fracture zones. T